XML 31 R22.htm IDEA: XBRL DOCUMENT
v3.23.1

Short-Term Investments (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2023
Short-Term Investments |
Summary of the short-term investments | The following table summarizes the short-term investments held at March 31, 2023 and December 31, 2022 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Gross Unrealized |  | Gross Unrealized |  | ​ | ​
​ | ​ | Amortized Cost | ​ | Gains | ​ | Losses | ​ | Fair Value
March 31, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Corporate debt securities | ​ | $ | 6,082 | ​ | $ | — | ​ | $ | (7) | ​ | $ | 6,075
Treasury bills | ​ | ​ | 4,949 | ​ | ​ | 3 | ​ | ​ | — | ​ | ​ | 4,952
Total | ​ | $ | 11,031 | ​ | $ | 3 | ​ | $ | (7) | ​ | $ | 11,027
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross Unrealized | ​ | Gross Unrealized | ​ | ​ | ​
​ |  | Amortized Cost |  | Gains |  | Losses |  | Fair Value
December 31, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Corporate debt securities | ​ | $ | 16,508 | ​ | $ | — | ​ | $ | (63) | ​ | $ | 16,445
Treasury bills | ​ | ​ | 5,983 | ​ | ​ | — | ​ | ​ | (3) | ​ | ​ | 5,980
Yankee securities | ​ | ​ | 2,000 | ​ | ​ | — | ​ | ​ | (1) | ​ | ​ | 1,999
U.S. agency bonds | ​ | ​ | 3,000 | ​ | ​ | — | ​ | ​ | (12) | ​ | ​ | 2,988
Reverse repurchase agreements | ​ | ​ | 178,500 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 178,500
Total | ​ | $ | 205,991 | ​ | $ | — | ​ | $ | (79) | ​ | $ | 205,912
​

X
- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
Name: | us-gaap_MarketableSecuritiesTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_ShortTermInvestmentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration